Compared Analysis of Deformation Monitoring with Numerical Simulation on Pile-Anchor Supporting System of Deep Foundation Pit in Soil-Rock Dualistic Area

2013 ◽  
Vol 353-356 ◽  
pp. 3598-3605
Author(s):  
Xiao Dong Yi ◽  
Peng Huang ◽  
Zhi Chao Wang
Keyword(s):  
Deformation Monitoring ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Dual Structure ◽  
Deep Foundation Pit ◽  
Finite Element Software ◽  
Whole Process ◽  
Practical Engineering ◽  
Similar Location ◽  
Design Construction

Deep foundation pit supporting in soil-rock areas has been occurred commonly in Dalian. In the dual structure deep foundation pit in which platform is reserved, pile-anchor support as a typical form of foundation pit support, how to play its role effectively and make the design economical and safety is the subject which was explored continuously in recent years. Through a practical engineering case, this paper will use finite element software ABAQUS to simulate the whole process of pit excavation. Simulation results show that the boundary of the dual structure is the key position that caused the “sharp deformation” of the supporting structure. Compared with monitoring data, the results indicate that the reliability of the numerical model and the relevant deformation laws are verified, which can be used for the reference for the design, construction and monitoring of the deep foundation pit support in the similar location.

scholarly journals Study on Flexural Bearing Capacity Calculation Method of Enclosure Pile with Partial Excision in Deep Foundation Pit

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Mingfeng Lei ◽  
Linghui Liu ◽  
Yuexiang Lin ◽  
Jin Li
Keyword(s):  
Flexural Strength ◽  
Bearing Capacity ◽  
Calculation Method ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Theoretical Derivation ◽  
Deep Foundation Pit ◽  
Practical Engineering ◽  
Capacity Calculation ◽  
Partial Excision

During deep foundation pit construction, the structural clearance intrusion, which is caused by the complex formation conditions and the inefficient drilling equipment, is usually detected due to the vertical deviation of piles. To meet construction requirements, pile parts intruding into the structural clearance are supposed to be excised. However, the sectional flexural strength of the pile is bound to decrease with partial excision, which would reduce the bearing capacity of the enclosing structure during construction. In this paper, a theoretical derivation of the normal sectional flexural strength of the partially excised circular pile is proposed. The derivation adopts the assumption of the plane section and steel ring equivalence and can be solved by the bisection method. Furthermore, the calculation method is applied to the pile evaluation of a practical engineering; also, the method is verified by the numerical method. The application results show that the excision of rebar and pile’s sectional area will cause a rapid linear decline in the sectional flexural strength. After excising 18 cm radial thickness of the circular pile (ϕ800 mm) and 6 longitudinal rebars, the sectional flexural strength of the pile decreases to 58% from the origin, which cannot meet the support requirement. The analysis indicates that pile reinforcements must be carried out to maintain the construction safety.

Analysis on the Design and Application of Prestressed Concrete Supporting Piles

2010 ◽  
Vol 44-47 ◽  
pp. 173-176
Author(s):  
Dong Ming Yu ◽  
Zhi Qin Liu ◽  
Feng Guang Chen
Keyword(s):  
Prestressed Concrete ◽  
Deep Foundation ◽  
Engineering Project ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Concrete Piles ◽  
Adjacent Building ◽  
Practical Engineering ◽  
Concrete Materials ◽  
Actual Settlement

The supporting piles of deep foundation pits are usually made in reinforced concrete materials and rarely in prestressed concrete materials. But prestressed concrete materials have higher stiffness and less deformation and are suitable for controlling displacements or settlements. So, in this paper a practical engineering project as an example, the prestressed concrete supporting piles of the deep foundation pit are calculated and designed. Then, the settlement and inclination of the building adjacent the foundation pit with the prestressed concrete piles are calculated in the numerical software, FLAC. The results calculated in FLAC are compared with the actual settlement and inclination of the adjacent building during the foundation pit is excavated. The comparison confirms the feasibility of the supporting structure. This is a useful trial on the design of the prestressed concrete supporting piles.

Applications of Soil Nailed Wall in Foundation Pit Support

2013 ◽  
Vol 353-356 ◽  
pp. 969-973
Author(s):  
Chun Mei Zhang
Keyword(s):  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
The World ◽  
Designing Method ◽  
Design Construction

Deep foundation pit support technology has widely affected the world, and well mainly talk about its application as a soil nailed wall in the engineering of underground garage foundation pit. Different ways of support were applied in different conditions to design construction examples, and then solutions of foundation pit support constructions were raised. So the engineering designing method has been proved correct and feasible.

Research on Application of Deep Foundation Pit Decompression Dewatering Technology and Impact on Surrounding Environment

2013 ◽  
Vol 671-674 ◽  
pp. 101-104
Author(s):  
Dong Dong Zhang ◽  
Jun Wen Ding ◽  
Rong Biao Wang
Keyword(s):  
Engineering Application ◽  
Pumping Test ◽  
Rail Transit ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Hydrogeological Parameters ◽  
Surrounding Environment ◽  
Practical Engineering ◽  
Research On Application

The studies application of deep foundation pit decompression technology focusing on special engineering geological and hydrogeological conditions. Taking foundation pit dewatering of certain rail transit station as an example, designs deep foundation pit decompression precipitation technology scheme with hydrogeological parameters obtained through pumping test, and assesses and monitors its impacts on surrounding environment according to measured data on project site, which has achieved good results in practical engineering application and provides foundation for construction of rail transit lines.

scholarly journals Safety Management System Prototype/Framework of Deep Foundation Pit Based on BIM and IoT

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Wenhan Fan ◽  
Jianliang Zhou ◽  
Jianming Zhou ◽  
Dandan Liu ◽  
Wenjing Shen ◽  
...  
Keyword(s):  
Management System ◽  
Safety Management ◽  
Deformation Monitoring ◽  
Structural Deformation ◽  
Underground Construction ◽  
Construction Sites ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Safety Management System ◽  
Deep Foundation Pit

With the huge demand for building underground spaces, deep foundation pits are becoming more and more common in underground construction. Due to the serious effects associated with accidents that occur in deep foundation pits, it is very important for underground construction safety management to be proactive, targeted, and effective. This research develops a conceptual framework adopting BIM and IoT to aid the identification and evaluation of hazards in deep foundation pit construction sites using an automated early warning system. Based on the accident analysis, the system framework of Safety Management System of Deep Foundation Pits (SMSoDFP) is proposed; it includes a function requirement, system modules, and information needs. Further, the implementation principles are studied; they cover hazardous areas, namely, visualization, personnel position monitoring, structural deformation monitoring, and automatic warning. Finally, a case study is used to demonstrate the effectiveness and feasibility of the system proposed. This research provides suggestions for on-site management and information integration of deep foundation pits, with a view to improving the safety management efficiency of construction sites and reducing accidents.

scholarly journals Numerical Simulation of Deep Foundation Pit Construction under Complex Site Conditions

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Huifen Liu ◽  
Kezeng Li ◽  
Jianqiang Wang ◽  
Chunxiang Cheng
Keyword(s):  
Numerical Simulation ◽  
Ground Surface ◽  
Reference Value ◽  
Horizontal Displacement ◽  
Deformation Monitoring ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Ground Surface Settlement ◽  
Stress And Deformation

Based on the deep foundation pit project of Laoguancun station of Wuhan rail transit line 16 and according to the engineering characteristics of the construction conditions and the site surrounding the environment, the method of combining field monitoring and finite element numerical simulation is adopted to analyze the law of stress and deformation of the deep foundation pit during excavation and support construction; it includes the horizontal displacement of the underground diaphragm wall, supporting axial force, and the ground surface settlement, which can be compared with measured data. Finally, some suggestions for monitoring and construction of the deep foundation pit in the subway station have been put forward and have certain reference value and practical guiding significance for the design and construction of similar engineering projects. The deformation monitoring of the retaining structure at the middle of the long side of the foundation pit should be strengthened during the construction process.

Research on Deformation Monitoring on Supporting Structure of Deep Foundation Pit Engineering Based on GPS

2012 ◽  
Vol 239-240 ◽  
pp. 595-598
Author(s):  
Zhong Xin Liu ◽  
Xue Jian Zhang
Keyword(s):  
Effective Means ◽  
Three Dimensional ◽  
Automatic Monitoring ◽  
Deformation Monitoring ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Supporting Structure ◽  
Observation Methods ◽  
Safety Warning

High-rise building deep foundation pits affect the peripheral physiognomy deformations directly, and brings serious hidden danger．deformation monitoring on supporting structure of deep foundation pits engineering is an effective means of construction safety warning. Three-dimensional coordinates of observation points can be available by GPS high precision positioning, and it is easier to realize of continuous, real-time and automatic monitoring than conventional observation methods.

The Study of Deformation Law of a Super Deep Foundation Pit in the Process of Dismantling the Inner Support

2014 ◽  
Vol 638-640 ◽  
pp. 614-619
Author(s):  
Bo Liu ◽  
Qing Nan Liu ◽  
Yi Yan Zhao ◽  
Bing Hui Chen
Keyword(s):  
Horizontal Displacement ◽  
Deformation Monitoring ◽  
Maximum Point ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Supporting Structure ◽  
The Earth ◽  
Earth Pressures ◽  
Deformation Law

Dismantling the inner support of deep foundation pit is a risk point.It is of great importance to guarantee the safety of foundation pit when removing the inner support, and the deformation monitoring and analysis in the process of dismantling inner support is crucial. In this paper, a super deep foundation pit engineering as the research background.Through monitoring and analyzing the law of a deep horizontal displacement of the supporting structure,ground settlement, vertical settlement and axial force of support in the process of support demolition,which can be obtained that: the settlement of surface ground around the foundation shows spatial and temporal clearly and the distribution of deep horizontal displacement of supporting structure is similar to the parabolic which the maximum point constant upward shift with supporting continuous removed.Soil pressure of supporting shared with support removing process is changing, and the earth pressures support sharing is increasing. From the monitoring results, the demolition scheme is reasonable and effective and meets the requirements of design and environment.

The Impact on the Surrounding Buildings of a Deep Excavation in Hefei

2014 ◽  
Vol 1021 ◽  
pp. 96-99
Author(s):  
Jia Yang Wang ◽  
Xiao Qiang Wang
Keyword(s):  
Residential Building ◽  
Deep Excavation ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Whole Process ◽  
Timely Feedback ◽  
Station Base ◽  
The Impact ◽  
Settlement Monitoring

According to the building settlement monitoring around the base pit, research the deep base pit excavation impacting on the surrounding buildings. Take Hefei subway station base pit project as example, by way of an adjacent residential building whole process of excavation monitoring, research the impact of deep excavation on the surrounding buildings. Timely feedback to the construction unit, to ensure the smooth construction of pit, and provides a reference to design and construction of deep foundation pit.

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